It wasn't something that felt practical at first, so I avoided it entirely on The New Order. But on The New Colossus, it's a must for higher difficulties, especially Death Incarnate. When you have enemies swarm in close on your corner, you can just let them have it with both guns at once, and it makes really short work of them.
Played a few games I got for free on PS Plus a while back: Journey and Furi. Journey was just kind of boring to me. Furi is excellent, though. Nice one-on-one gun/sword battles, and the retrowave music is pretty nice, too.